Pump



Sept. 4, 1945. R. J. JAUCH ETAL UMP Jun

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PUMP

' 6 Sheets-Sheet 3 Filed June 23, 1944 4 ,l \\\\\\\\\:1 I, I vi TE I l A0 7/7/11 n I I 1 Y mmvron fiober'tJJaqch, y .ilzarwo' d mafia,

sept- 1945- R. J. JAucl-l ETAL 2,384,172.

PUMP

Filed June 23, 1944 6 Sheets-Sheet 5 INVENTOR. fiober'z J Jag 1 ch fjfzerwoiiflndg R. J. JAUCH ETAL PUMP Filed June 23, 1944 Sept. 4, 1945.

6 Sheets-Sheet 6 Patented Sept. 4, 1945 ,PUMP

Robert J. Jauch, Fort Wayne, and Sherwood Hinds, Columbia City, Ind.,asslgnors to The Wayne Pump Company, Fort Wayne, 11101., a

corporation of Maryland Application June 23, 1944, Serial No. 541,766

8 Claims. (01. 103-113) This invention pertains to pumping units andmore particularly pumping units adapted particularly to handle volatileliquids such as gasoline, benzene, naphtha and the like.

. Some liquid pumps are adapted particularly to handle liquids such aswater, where there is substantially no problem involved in handling airor vapor in connection with the dispensing of the liquid, and where itis not necessary to deliver solid liquid for metering. However, thereare- 1 stantially dry condition and wherein there is little opportunityto conveniently prime the pump by means external 01' the pump.

Further, it is desired that the dispensing means in the pump operateunder the most favorable conditions, that is, a condition of floodedsuction even though the actual source of supply from which the pump isdrawing is at a lower level than the actual pumping unit. 1

Additionally, where airplanes and other vehicles are being fueled, it ishighly'desirable and frequently necessary that the fuel be supplied,vapor-free, at a high rate.

In the case of positive displacement pumps now being used, there is asubstantially metal-to-metal engagement between the operating parts.These pumps, which include the gear type of pump. can be counted upon toproduce a substantially high vacuum (26" to 28" of mercury, depending onthe locality), when wet or primed. The gear type of pump, however,cannot be successfully used with tolerances close enough to produce ahigh vacuum when dry when dispensing non-lubricating liquid such asgasoline, the wear is excessite. This also applies to the other positivedisplacement type of pumps such as the bucket, bladed type, and thelike. There is an additional diiliculty with these pumps in. that whenit is attempted to prime them dry or when the liquid becomes vaporized,or when they run dry in operation, an often disastrous wear takes placedue to the lack of the lubrication provided by the liquid being pumped.

more stages, is simple in construction having a rapidly whirling wheelor impeller that in itself is incapable of producing high vacuum, butcandispense liquid efllciently if the liquid is brought to the inlet oreye of the impeller. As in the case of positive displacement pumps,centrifugal pumps can likewise be broken down into a number of types.Generally they fall into three classifications, the conventionalcentrifugal which operates on flooded suction, employed for dispensingonly. The centrifugal, to which has been added some means for effectinga prime, placing it in the classification of a self-priming centrifugal.Still a third employs means for establishing prime and the continuouselimination of air or vapor which may be referred to as a self-priming,air-eliminating centrifugal unit. This latter type isshown and describedin Patent No. 2,124,681 to Jauch et a1. granted July 26, 1938. g

A piston type pump is a very eillclent type of pump to create a vacuum,but has been found to be very inefllcient to pump liquid, andadditionally cannot operate at high speed and will not deliver a steadystream of liquid.

It is thus desirable to provide a pump which Another object is toprovide a pump which is self-priming and wherein liquid is dispensedonly after a predetermined pressure is built up.

Another object is to provide a pump wherein a centrifugal pump'is usedfor dispensing liquid, but wherein the pump is primed and air eliminatedby a piston type pump.

Another object is to provide a pump wherein a centrifugal pump is usedto dispense solid liquid and wherein air and vapor is eliminated on thesuction side of the centrifugal pump.

Another object is to provide a liquid dispensing apparatus operabletodispense liquid after a predetermined pressure is built up.

Another object is to provide a pumping'unit operable after apredetermined vacuum is attained, but capable of throttling ln-the eventof leakage in the suction or reduction of vacuum.

Another object is to provide a pump 'l unit capable of delivery underthe most favorable simulated conditions, i. e., flooded suction,regardless of the disposition of the'source of supply.

With these and variom other objects in view,

-the invention'may consist of certain novel features of construction andoperation as will be more fully described and particularly pointed outin the specification, drawings and claims appended hereto.

In the drawings which illustrate embodiments of the device and whereinlike reference characters are used to designate like parts- Figure 1 isa side'elevation, partly in section. of one form of pump embodying theinvention, the section being taken through the inlet, suction tank andpiston pump;

Figure 2 is a top plan view, partly in section, of the pump illustratedin Figure 1, the section being taken substantially in the plane asindicated by the line 2-2 of Figure 1;

Figure 3 is a transverse sectional elevation taken substantially in theplane as indicated by the line 3-3 of Figure 2;

Figure 4 is a side elevation of the pump illustrated in Figures 1 to 3,the same looking toward the left as viewed in Figure 2;

Figure 5 is an elevation, partly in section, of a modified form of pumpembodying the invention;

Figure 6 is an elevation ofthe pump illustrated in Figure 5, the samelooking toward the right as viewed in said figure;

Figure 7 is an enlarged fragmentary sectional .elevation of a portion ofthe pump shown in anti-friction bearings 24 and 26, the bearings 24being retained in place as at 28, while the bearings 26 are retained inplace as at 30.

Shaft I8 is provided with the sleeve 32, pressed or otherwise tightlyfitted to said shaft, and the seal 34 is disposed to prevent leakagethrough the end plate 36 of the housing adjacent the sleeve 32.

The shaft "I8 is provided with the eccentric 38 (or crank), saideccentric being keyed as at 40 to said shaft and being positioned bymeans of the nut 42, threaded to the crank shaft. The opposite end ofthe eccentric 38 bears against and is positioned by the sleeve 44 onwhich the oiling disc 46 is non-rotatably mounted.

Bearing 28 is mounted on a diminished portion of thesleeve 44 and theinner race ring abuts a. shoulder 48 of the shaft, and the outer racering abuts against a seal 50, disposed in the recess 52, provided in theinner crank case cover 54 of the crank case 20, said cover 54 beingsuitably secured to the pump housing 22.

The piston or connecting rod 56 is rotatably mounted on the eccentric 38and the upper end of said piston rod is pivotally connected through thewrist pin 58, to the piston 60, slidably mounted in the cylinder 62, thepiston 60 being provided with suitable rings 64. The connecting rod isprovided with the pin 66, adapted to dip into oil contained in the oilpan 68, whereby lubrication is had by the splashing of the oil by thepin. Constant level is maintained in the pan 68 by means of the disc 46,which constantly dips into the sump I0 of the crank case below the pan68. This causes the oil to be taken from the sump and thrown bycentrifugal force around the wall of the crank case where it drains.back into the pan 68. The oiling means just described and the valves tobe described are more particularly shown in Patent No. 2,267,479, Sturmet aL,

granted December 23, 1941.

communication with the atmosphere through the pipe 82, which may beprovided with a suitable mufller, not shown, The inlet valve I4communicates with the passage 84, which in turn communicates with thepassage 86 provided in the crank case housing, said passage 86 beingconnected to pipe 88 through'coupling 90, and com-' municating withpassage 92 through coupling 94.

Passage 82 is disposed in the suction inlet casting 96, which issuitably secured to the impeller pump housing 22.

The casting 96 is provided with the inlet 98 which communicates throughscreen I00 with the suction tank I02 and said casting is provided withthe passage I04 which communicates with the passage I06 of the impellerpump housing 22, the passage I06 communicating with the eye I08 of theimpeller 0, said impeller being fixed to the shaft I8.

The suction tank I02 is provided with the riser tube II2, communicatingwith the passage 92 and extending to a point adjacent the top of thesuction tank I02. The upper end of the riser tube H2 is provided withthe valve II4, controlled by the float H6. The float H6 is pivoted as atII8 to the lever I20, said lever being pivoted as at I22 to a support onthe valve seat I24 and the opposite end of the lever being looselyconnected to the valve as at I26. The float is provided with the guidestern I28, slidably mounted in the guide I30 carried by the tube II2.

In order to prevent the piston 60 from pumping oil the pressures on theopposite sides of the piston are substantially balanced by the passageI32 which connects the passage 86 with the inside of the crank casehousing 20.

The impeller II 0 isadapted to rotate in the impeller discharge housingI34, said discharge housing communicating with the passage I36 providedin the outlet valve housing I38. The housing I36 is provided with theoutlet passage I40, adapted to be closed from the passage I36 by meansof the sleeve valve I42, said'sleeve valve being adapted to closecommunication between said passages when it is seated on the valve seatI44.v The sleeve valve is adapted to slide in the cylinder I46 providedin the'housing I38, the valve being provided with a suitable piston I43which is made substantially liquid tight by means of suitable springpressed leathers IE0 or other suitable means. 4

v The valve and piston are provided with the balancing orifice I52 whichprovides communication between opposite sides of the piston, and asuitable spring I54 is provided seated at one end on the piston and atother end in the spring seat I56 in the-housing I58,,said spring urgingthe 'posite to the passage I88, communicates through passages I80 andI82 with the seat I84, said seat being provided with the valve I88 urgedtowards 'closed position by means of the spring I88. Y The spring I68seats at one end on the spring seat I of housing I and at the-other endon the flexible diaphragm I12, said diaphragm being secured between theflanges I14 and I18 of housings I88 and Ill. The diaphragm is providedwith the plunger Ill extending through the guide I80 and engaging thevalve I88 for controlling said valve by the spring I88 and the diaphragmI12. The valve chamber I82 communicates through the passages I84 and I88with the impeller suction chamber I 08. The housing III for the springI88 communicates through coupling I80, pipe I82 and coupling I84 withthe inside of the crank case housing 20.

While the tube I82 is shown as connected to the crank case housing(being vacuumlzed through the passage I82), it is of course understoodthat this tube could be connected to the suction side of the pistonpump, that is, it might be connected to the passage 84, pipe 88 orpassage 82.

It has been found, however, that by connecting it to the vacuumizedcrank case housing that a lighter spring I88 can be provided and thereis less fluttering efi'ect of the diaphragm I12.

Let it be assumed that the pumping unit described is connected throughthe inlet 88 with a source of supply at a lower level than the inlet 98,and that the pumping unit is dry and has absolutely no priming liquid inany part of the unit, and that it is desired to draw the liquid from thesource of supply and deliver it to a container as through a meter. Inthe pumping of some liquid, such as gasoline, at true measure must behad of the liquid to be dispensed, thus no air can be delivered throughthe outlet I40 to meter. Operation of the motor I2 or other source ofpower supply causes rotation of the shaft I8, which in turn rotates theimpeller IIO and causes reciprocation of the piston 80. The pump beingdry, the valve I42 will be closed, that is, will be in' the position asillustrated in Figure 2 and the valve I86 will also be closed. The-valveH4 in the suction tank will be open.

Rotation of the shaft II8 causes the piston pump to vacuumize thesuction tank I02 through valve II4, pipe I I 2, passage 82, pipe 88,passage 84 and inlet valve 14. During operation of the piston pump itwill be noted that the chamber of the crank case is also vacuumizedthrough the passage I32 50 that there is no tendency for the piston topump oil and there will be a proper lubrication, without loss oflubricant.

The pin 88 will dip into the oil in the pan 88 causing the oil to splashto the rotating parts in the crank case housing and rotation of the disc'48 will cause oil to be thrown by centrifugal iorce'toithe sides of thecrank case housing, where it. will= drain into the pan 88; maintainingthe proper level, all as described in said Patent No. 2,267,479.

When the piston pump is vacuumizing the suction tank, it also isvacuumizing the impeller pump housing, the passage I38 and the cylinderI48, whereby there is a balanced condition of the valve so that underthis condition the spring I84 is the only means of maintaining the valveI42 in seated position.

The vacuum induced in the suction tank I02 causes liquid to be drawnfrom the source of supply through the passage 88 into the suction tankI02, through the screen I00. It will then be drawn through the passageI04, the impeller suction maintain the balanced condition of the. valve.

This liquid delivered through orifice I82 is not at suflicient pressureto open the valve I88. Liquid will continue to be supplied to thesuction tank I02 with the valve I42 closed until a predetermined liquidlevel is reached, at which time the float I I6 will close the valve II4.

' Closing the valve I I4 will cause a high vacuum through passages 84,I32, crank case housing 20, pipe I92 and housing I, thus causing a highvacuum on the diaphragm I12. The :float and valve are so arranged thatthe valve I I4 will close long prior to the approach of the liquid levelto the valve so that no liquid can ever get into the piston. pump Inother words an air chamber is always insured at the top of the tank I02.This high vacuum will cause the diaphragm to move upwardly as viewed inFigure 2 against the spring I68, raising the pin I'I8 from the valveI86, permitting the valve to open, thus permitting liquid to flowthrough passages I84I 86 to the impeller suction housin I06. The orificeI52 being smaller than the opening controlled by the valve I66 willcause a reduction of pressure in the cylinder I48- n the side of thevalve opposite to the seat I44. This condition will permit the increasedpressure on the side of the valve adjacent the seat I44 to open thevalve I42, permitting discharge through the outlet I40.

It will be understood that the valve I42v will only open in the eventthere is solid liquid at the valve; in other words, if there is air or amixture of air and liquid at the valve I42, said valve will not openeven though the valve I66 opens. The valve I86 opening prior to theopening of the valve I42 permits the air or mixture of air and liquid atthe valve I42 to pass through the orifice I52, passage I82, passages I84and I86 to the impeller suction chamber I06. The air then will work itsway back into the suction tank I02 where it will seek a high level andwill evacuate whenever the valve II4 opens. When there is solid liquidat the valve I42, said valve will open as already described andthereafter should air be introduced into the suction line between. thepump and the source of supp y. said air will enter the suction tankI02,causing a drop in the liquid level. within the tank which in turncauses the float II6 to drop, opening the valve H4.

As soon as the valve I I4 opens the air in the suctiontank will be drawnthrough the riser tube II2, passage 92, pipe 88, and through the pistonpump to the atmosphere through the pipe 82. As soon as air isdischarged, the liquid level in the suction tank will rise, causin thevalve II4 to close, which in turn causes the valve I66 to open as in themanner already described, thus permitting valve I42 to open and thedispensing operation to continue. Should there be continuous leaking,that is, to a point where the valve H4 is alternately opening orclosing, the pump will still continue to discharge liquid at a reducedquantity, though the valve I42 will throttle, and the pump will continueto deliver liquid until the amount of air introduced into the suctiontank exceeds the displacement of the piston pump, at

which time the pressures on opposite sides of the' diaphragm I12 willequalize, causing the valve I66 to close and consequently causing thevalve 254 and a suction or inlet chamber 258' communicating with asuitable inlet 258. The impeller housing 254 is closed by means of thecover plate 260, and the impeller 262 is rotatably mounted in saidimpeller housing. The outer periphery of the eye of the impeller rotatesin the fixed wearing ring 264 and the clearances between the outerperiphery of the impeller eye and the ring are such that no wear takesplace between these parts. The wear ring is provided with the reentrantflange portion 266 directed into the eye of the impeller so that shouldany liquid pass between the impeller and the ring 264 it will bedirected into the eye of the impeller rather than against the liquidnormally entering the eye.

The impeller is rotated by means of the shaft 268 secured thereto as at210 and said shaft passes through a gasoline seal 212 and oil seal .214and is supported on bearing 216 retained by the ring 218. The shaftextends into the vacuum pump crank case 280 and is rotatably mounted onbearing 282 provided in the housing 284 in which is disposed the seal266. The shaft extends outwardly of housing 284 and provides aportion268 for coupling to suitable drive means such as an electric motor,gasoline motor or the like. The impeller chamber 254 is provided with avoluted outlet passage 280 and is provided with the flange 292 fastenedas at 294 to the flange 286 of the outlet valve housing 288.

The outlet valve housing is provided with the outlet 300 provided withthe flange 302 adapted to be secured to suitable discharge means. Asleeve valve 304 is adaptedto close the outlet 800 and is adapted to bemoved vertically upwardly from the position illustrated in the Figure 8to ing 828 and is suitably secured thereto. The other end of the lever840 engages the slidevalve 848, said valve being adapted inclosedposition to be seated on the seat 860 provided on the pedestal 844,thepedestal being supported on the pipe 352 permitting ingress to theauxiliary float chamber 854. A restrictive opening 856 permitscommunication between the chamber 826 and pipe 852 for the purpose to belater described.

Within the auxiliary float'chamber 854 there is provided a float 858,said float being provided with a supporting rod 360 pivoted at 862 tothe support 864, and rod 866 is pivoted as at 868 to the rod 860 and ispivoted as at 310 to the slide valve 812. Upward movement of the floatcauses the valve 812 to move upwardly and be seated in closed positionon the seat 814. The seat 814 communicates with the pipe 816, the

' other end of said pipe being connected as at 818 open the outlet. Thesleeve valve 804 is adapted to reciprocate in the cylinder 806 and isprovided with the valve rod 808 extending upwardly and having the piston8'l0 secured thereto. A suitable weight8l2 continually urges the valve804 toward closed position on itsseat 8. There is,

however, a passage through the sleeve valve as indicated by the arrow8l6 and there is clearance at 826 to the pump housing 252, and surgering 888 is interposed between said housings to prevent a sudden surgeof the liquid upwardly into the housing 326, and within the housing 826there is also provided a baflle surge ring 882 fixed to the float 884 sothat should there be a surge of liquid the float and surge ring would beurged upwardly by the force of the liquid as well as the buoyancy of theliquid. The float 884 is provided with the guiding and lifting'rod 886pivoted adjacent the upper end as of 888 to the lever 840, the leverbeing pivoted as at 842 to the pedestal 884. I

The cap 846 closes the upper end of the housto the suction valve chamber880 provided in the piston head 882 of the vacuum pump.

The head 882 is supported on the cylinder block 884 which is preferablyintegral with, the crank case 280 and is suitably secured to the pumpcasing 252 whereby a unitary structure is provided. The shaft 266 isprovided with the crank shaftportion 366to which the piston rod 866 isrotatably secured. The upper end of the piston rod is secured throughthe pin 880 to the reciprocating piston '392. -The crank shaft 886 isprovided with the oiling disc 884 offset to act as a counterbalance forthe piston, and being adapted to dip into the lubricant in the crankcase to throw it outwardly whereupon it can be trapped within the pan886and any excess may overflow and spill into the crank case. The pistonrod 888 is provided with the splash pin 888 'adapted'to dip into theliquid. The pan 866 for lubricating purposes, has already been describedand the lubricating passage 400 is provided for conducting lubricant tothe bearing 216.

The head 882 is provided with the suction valve chamber 880 closed bythe suction valve 402 and is provided with the outlet valve chamber 404closed by the outlet valve 406. The chamber 404 is provided with theplug 408 which may be removed for connecting the chamber to a suitableremote vent such as where the connection is carried back to the supplytank and vented therethrough. A muiller 4| 0 is also secured to the head882 and in communication with the chamber 404 and is used unless theremote vent is used. A- passage 2 forms a communication between thesuction valve chamber 860 and the crank case 280 for equalizing thepressures therebetween whereby there is no tendency for oil the inletchamber 256 and the float chamber housing 826 at a suitably high pointin the housing 826 whereby should'there be an influx of air into theinlet chamber this air will quickly find its way above the float and canthus be quickly exhausted through the vacuum pump without having 'toseek its way through the liquid con tained in the float chamber housing.

Assuming that the inlet 258 is secured to a suitable source of supplyand assuming that the-outlet 802 is secured to a suitable dispensingmeans and that the centrifugal pump is dry and it is desired to d penseliquid, the operating means causes rotation of the shaft 2" thusrotating the impeller 2'2 and the crank shaft I" reciproeating thepiston 39!. The valve 304 will be closed and therefore no fluid can bedrawn from the outlet through passage 32! and pipe I to the suctionchamber 256. Reciprocation of the piston causes a vacuum to be producedthrough chamber Ill, pipe 316, chamber), housing 326 and inlet chamber255. The air will be withdrawn through .the connections just named andexpelled as through the vent or'muiller ill, or connection at 408whichever is used. Liquid will/finally be drawn into the inlet chamber2" and will rise into the float chamber housing I" to a point where thefloat 334 is raised to close the valve "8.

Liquid then will be moved through the volute said impeller chamber, theeye of said impeller communicating with the suction chamber forreceiving liquid therefrom, a housing comprising a float chambercommunicating with said suction chamber adjacent the bottom of saidfloat chamber, a passage communicating with said suction chamber andextending upwardly and communiand vapor from said float chamber, saidmeans III by the impeller to the valve 1 and liquid under pressure willpass through the valve upwardlyand will act on the underside of thepiston ill. At the same time, suction from the inall air trapped, fromtime to time, in the casing 252 so that the impeller will always pumpsolid liquid. It is to be noted that should any air be introduced intothe housing 258 it; will immediately cause the valve 304 to be closed orthrottled as the vacuum above the piston 3! will be reduced thuspermitting the weight ill to immediately become effective to close orthrottle the valve.

The valve is necessary where it is desiredthat air elimination takeplace where a suflicienthead on the outlet side is not provided toinsure that the air be raised above the impeller housing so that it canreadily be discharged through the vacuum pump. If a meter is 'not to beused in connection with the pump, of course, no automatic valve isnecessary and a hand operated valve may be used. Should the float l"fail and should liquid rise a sufficient height in the housing 326 toflow into the auxiliary housing 354, the float 358 will close the valve312 and prevent liquid from flowing into the inlet chamber 380. Should,however, both floats fail,- the restricted opening 355 is so determinedthat only an amount of liquid will be supplied to the vacuum pump thatcan be readily discharged. Should leakage occur past the seal- 214, itwould be an oil leakage and the oil would pass through the tell-tale litand when detected would indicate that the seal 2" leaked. Should,however, gasoline or the pumped fluid pass through the telltale 8, itwould indicate that the seal 212 was leaking.

It is to be understood that we do not wish to be limited by the exactembodiment of the device shown, which is merely by way of illustrationand not limitation, as various and other forms of the comprising apiston pump having a crank .case and a cylinder thereabove, a crankshaft in said crank case, said crank shaft extending into saidcentrifugal pump casing and providing a shaft for said impeller, apiston reciprocally mounted in said cylindermand connected by means of aconnecting rod to said crank shaft, 8. cylinder head .on said cylinderhaving a suction chamber and an exhaust chamber, valves between saidchambers and the upper part of said cylinder above thepiston, aconnection between said float chamber and said piston pump suctionchamber, a connection between said piston pump suction chamber andsaid'crank case, a discharge valve connected to the impeller chamberoutlet; means urging said valve to closed position, a housing having acylinder adjacent said valve connected chamber and a suction chamber,said suctionchamber having-an inlet and said impeller chamber having anoutlet, an impeller rotatably mounted in said impeller chamber, the eyeof said impeller communicating with the suction chamber for receivingliquid therefrom, a housing comprising a float chamber communicatingwith said suction chamber adjacent the bottom of said float chamber, anoutlet adjacent a high point in said float chamber, a float andvalve-for controlling said outlet in accordance with the liquid level insaid float chamber, means for exhausting air and vapor from said floatchamber, said means comprising a piston pump having a crank v case and acylinder thereabove, a crank shaft in said crank case, said crank shaftextending into said centrifugal pump casing and providing a shaft forsaid impeller, a piston reciprocally mounted in said cylinder andconnected by means of a connecting rod to said crank shaft, a cylinderhead on said cylinder having a suction chem? ber and an exhaust chamber,valves between said chambers and the upper part of said cylinder abovethe piston, a connection between said float chamber and said piston pumpsuction chamber; a connection between saidpiston pump suction chamberand said crank case, a discharge valve connected to the impeller chamberoutlet, means urging said valve to closed position, a housing having acylinder adjacent said-valve connected to said crank case wherebysuction from said crank case is imparted to said last named cylinder, apiston in said last named cylinder connected to said last named valvewhereby suction in chamber for receiving liquid therefrom, a housingcomprising a float chamber communicating with said suction chamberadjacent the bottom of said float chamber, a passage communicating withsaid suction chamber and extending upward ly and communicating with saidfloat chamber adjacent a high point thereof, an outlet adjacent a highpoint in said float chamber, a float and valve for controlling saidoutlet in accordance with the liquid level in said float chamber, meansfor exhausting air and vapor from. said float chamber, said meanscomprising a piston pump having a crank case and a cylinder 'thereabove,a crank shaft in said crank case, said crank shaft extending-into saidcentrifugal pump casing and providing a shaft for said impeller, apiston 'reciprocally mounted in said cylinder and connected by means ofa connecting rod to said crank shaft, a cylinder head onsaid cylinderhaving a suction chamber and an exhaust chamber, valves between saidchambers and/the upper part of said cylinder above the piston, aconnection between said float chamber and said piston pump suctionchamber, and a connection bet/ween said piston pumpsuction chamber andsaid crank case.

4. In a pumping unit, the combination of a centrifugal pump casinghaving an impellerchamber and a suction chamber, said suction chamberhaving an inlet and said impeller chamber having, an outlet, an impellerrotatably mounted in said impeller chamber, the eye of said impellercommunicating with the suction chamber for receiving liquid therefrom, ahousing comprising a float chamber communicating with said with saidsuction chamber 'adiacent'the bottom of said float chamber, a passagecommunicating with said suction chamber and extending upwardly andcommunicating with said float chamber adjacent a high point thereof, anoutletadjacent a high point in said float chamber, a float and valve forcontrolling said outlet in accordance with the liquid level in saidfloat chamber, means for exhausting air and vapor' from said floatchamber, said means comprising a piston pump having a crank case and acylinder thereabove, a crank shaft in said crank case, said crank shaftextending into said centrifugal pump casing and providing a shaft forsaid impeller, a piston reci-procally mounted in said cylinder andconnected by means of a connecting rod to said crank shaft, a cylinderhead on said cylinder having a suction chamber and an exhaust chamber,

suction chamber adjacent the bottom of said float chamber, an outletadjacent a high point in said float chamber, a float and valve forcontrolling said outlet in accordance with the liquid level in saidfloat chamber, means for exhausting air and vapor from said floatchamber, said means comprising a piston pump having a crank case and acylinder thereabove, a crank shaft in said crank case, said crank shaftextending into said centrifugal pump casing and providing a shaft forsaid impeller, a piston reciprocally mounted in said cylinder andconnected by means of a connecting rod to said crank shaft, a 'cylinderhead on said cylinder having a suction chamber and an exhaust chamber,valves 'be-,

chamber and a suctionchamber, said suction chamber having an inletand'said impeller chamber having an outlet, an' 'impeller rotatablymounted in said impeller chamber, the eye of said impellercommunicatingwith the suction chamber for receiving liquid therefrom, ahousing comprising a float chamber communicating valves between saidchambers and the upper part of said cylinder above the-piston, and aconnection between said float chamber and said piston pump suctionchamber.

6. In a pumping unit, the combination of a centrifugal pump casinghaving an impeller chamber and a suctionchamber, said suction chamberhaving an inlet and said impeller chamber having an outlet, an impellerrotatably mounted in said impeller chamber, the eye of said impellercommunicating with the suction chamber for receiving liquid therefrom, ahous-' ing comprising a float chamber communicatin with said suctionchamber adjacent the bottom of said float chamber, a passagecommunicating with said suction chamber and extending upwardly andcommunicating with said float chamber adjacent a high point thereof, anoutlet adjacent a high point in said float chamber, a float and valvefor controlling said outlet in accordance with the liquid level in saidfloat chamber, means for exhausting air and vapor from said floatchamber, said means comprising a piston pump having a crank case and acylinder there a connection between said float chamber and" said pistonpump suction chamber, adischargev valve connected to the impellerchamber outlet,

means urging said valve to closed position, a housing having a cylinderadjacent said valve" connected to said piston pump suction chamberwhereby suction from said chamber is imparted to said last namedcylinder, a piston in said last named cylinder connected to said lastnamed valve whereby suction in said last named cylinder urges said lastnamed valve to open position, said last .named valve being opened whensaid suction and the liquid delivery pressure on said valve reaches apredetermined amount.

7. In a pumping unit, the combination'of a I with said suction chamberadjacent the bottom of saidfloat chamber, an outlet adjacent a highpoint in said float chamber, a float and valve for controlling saidoutlet in accordance with the liquid level in said float chamber, meansfor ex- .hausting air and vapor from said float chamber, said meanscomprising a piston pump havin: a

crank case and a cylinderthereabove, a crank shaft in said crank case,said crank shaft extending into said centrifugal pump casing andproviding a shaft for said impeller, a piston reciprocally mounted insaid cylinder and connected by means of a connecting rod to said crankshalt, a cylinder head on said cylinder having a suction chamber and anexhaust chamber, valves between said chambers and the upper part of saidcylinder above the piston, and a connection between said float chamberand said piston pump suction chamber.

8. In a pumping unit, the combination of a centrifugal pump casinghaving an impeller chamber and a suction'chamber, said suction chamberhaving aninlet and said impeller chamber having an outlet, an impellerrotatably mounted in said impeller chamber, the eye of said impellercommunicating with the suction c amber for receiving liquid therefrom, ahouslug comprising a float chamber communicatins with said suctionchamber adjacent the bottom of said float chamber, an outlet adjacent ahigh point in said float chamber, a float and valve for controlling saidoutletin accordance with the liquid level in said float chamber, meansfor exhausting air and vapor from said float chamber, said meanscomprising a piston pump having a crank case and a cylinder thereabove,a crank shaft in said crank case, said crank shat-t extending into saidcentrifugal pump casing and providing a shaft for said impeller, apiston reciprocally mounted in said cylinder and connected by means oi aconnecting rod'to said crank shalt, a cylinder head on said cylinderhaving a suction chamber and an exhaust chamber, valves between saidchambers and the upper part or said cylinder above the piston, and aconnection between said float chamber and said piston pump suctionchamber, a discharge valve connected to the impeller chamber outlet,means urgingsaid valve to closed position, a housing having a cylinderadlacent said valve connected to said piston pump suction chamberrwhereby suction from said chamber is imparted tosaid last namedcylinder, a piston in said last named cylinder connected '-to said lastnamed valve whereby auction in said last named cylinder urges said lastnamed valve to open position. said last named valve being opened whensaid suction and the liquid delivery pressure on said valve reaches apredetermined amount.

' ROBERT J. JAUOH. 00D KINDS.

